Edit

Share via

_EFN_StackTrace Function

  • Article

Provides a text representation of a managed stack trace and an array of CONTEXT records, one for each transition between unmanaged and managed code.

Syntax

HRESULT CALLBACK _EFN_StackTrace(
    [in]  PDEBUG_CLIENT  Client,
    [out] WCHAR          wszTextOut[],
    [out] size_t         *puiTextLength,
    [out] LPVOID         pTransitionContexts,
    [out] size_t         *puiTransitionContextCount,
    [in]  size_t         uiSizeOfContext,
    [in]  DWORD          Flags
);

Parameters

Client [in] The client being debugged.

wszTextOut [out] The text representation of the stack trace.

puiTextLength [out] A pointer to the number of characters in wszTextOut.

pTransitionContexts [out] The array of transition contexts.

puiTransitionContextCount [out] A pointer to the number of transition contexts in the array.

uiSizeOfContext [in] The size of the context structure.

Flags [in] Set to either 0 or SOS_STACKTRACE_SHOWADDRESSES (0x01) to show the EBP register and the enter stack pointer (ESP) in front of each module!functionname line.

Remarks

The _EFN_StackTrace structure can be called from a WinDbg programmatic interface. Parameters are used as follows:

  • If wszTextOut is null and puiTextLength is not null, the function returns the string length in puiTextLength.

  • If wszTextOut is not null, the function stores text in wszTextOut up to the location indicated by puiTextLength. It returns successfully if there was enough room in the buffer, or returns E_OUTOFMEMORY if the buffer was not long enough.

  • The transition portion of the function is ignored if pTransitionContexts and puiTransitionContextCount are both null. In this case, the function provides callers with text output of only the function names.

  • If pTransitionContexts is null and puiTransitionContextCount is not null, the function returns the necessary number of context entries in puiTransitionContextCount.

  • If pTransitionContexts is not null, the function treats it as an array of structures of length puiTransitionContextCount. The structure size is given by uiSizeOfContext, and must be the size of SimpleContext or CONTEXT for the architecture.

  • wszTextOut is written in the following format:

    "<ModuleName>!<Function Name>[+<offset in hex>]
...
(TRANSITION)
..."

  • If the offset in hex is 0x0, no offset is written.

  • If there is no managed code on the thread currently in context, the function returns SOS_E_NOMANAGEDCODE.

  • The Flags parameter is either 0 or SOS_STACKTRACE_SHOWADDRESSES to see EBP and ESP in front of each module!functionname line. By default, it is 0.

    #define SOS_STACKTRACE_SHOWADDRESSES   0x00000001

Requirements

Platforms: See System Requirements.

Header: SOS_Stacktrace.h

.NET Framework Versions: Available since 2.0

See also